OSPF Not So Stubby Area (NSSA) di Juniper

Basic Knowlegde

An OSPF stub area has no external routes, so you cannot redistribute from another protocol into a stub area. An NSSA allows external routes to be flooded within the area. These routes are then leaked into other areas. However, external routes from other areas still do not enter the NSSA.
You cannot configure an area to be both a stub area and an NSSA.

Question :
If i want to set area 20 as a Not So Stubby Area, which router should i configure?. How can a route table from RIP Routing pass another OSPF area?

Answer :
You have to configure ABR Router and ASBR Router within the Area 20. Use NSSA command to leak External routing (RIP) to another OSPF area.